英文關鍵字
behind
book
boy
casual
caucasian
chair
college
computer
concentrate
concentration
desk
education
expression
face
gesture
hand
head
hipster
holding
home
homework
indoors
institution
knowledge
laptop
learning
lesson
male
man
marker
mouth
notepad
one
pen
pencil
pensive
sitting
student
study
studying
table
teenager
text
thinking
thoughtful
typing
university
work
young